There you have it, this show is pretty much Power Rangers with fan service. By no means does that make it a bad show, and this box set comes with both "Gravion & Gravion Zwei" two seasons in one. Not bad for the money if your into machines that can't do nothing alone, but combined they form a super big robot that can do anything.
Season One starts out with Eiji being tricked into piloting one of the worthless machines, while trying to look for his sister. The show picks up from there, and by the end of season one a lot of questions have been asked but no answers were given.
Season Two starts out by trying to be funny, which ruins some of what the first season built up. Season two gets better at the end, when it returns to the seriousness of the show, but the first four to five episodes tries to hard to please the fan service crowed, with nudity being put into the show more. The show never shows too much nudity, but this show is not recommended for a younger audience. It's pointless fan service, and the characters start (Mostly Eiji) to curse more than need be for this type of show (In the English Dub anyway, have not watched the Japanese subtitles yet). The start of season two just brings the whole series down, but luckily the that last 9 episodes picks the show back up.
As far as dubs go, the English dub is good. Chris Patton-which also did voice work for Chrono Crusade, Dragon Ball Z, Area 88, and much more, does the voice for Eiji. He does a good job, and you can tell he put a lot of work into the emotions of the character. The rest of the cast, does an good excellent job as well. However, for you purist out there the Japanese audio track is there for you with all subs you can read.
Overall the quality of this box set is sub par, the DVDs are not on an individual disk holder, but rather the six DVDs are all put on one spool, which makes accessing the individual disk a nightmare, plus the top DVDs never stay on the spool which leads to scratches.
The show itself is worthwhile, but the second season makes the show forgettable, you will enjoy the show while you watch it, but will forget the show almost as soon as you finished watching it. I would borrowing from a friend, or if your into Mechs, and power ranger type teams, than go for it. You won't regret watching this show. I enjoyed watching this show. The price for two seasons is not bad, over all a 4 star rating. Losing one star because of the first few episodes of season two, and the DVD case itself.